I been this days trying to choose between Shai or Woosa to be my main. I like Shai since Im a partial lifeskiller and lifeskilling is partially easy with it and have a good end game grinding but Woosa have a higher grind since her AoE skills and super armor makes you be more laid back. Also who don't love Shai music? So I want to hear opinions about it.
Play what you like more. You can also tag both, though you can't tag Sol. Shouldnt be a issue while Woosa awakening doesnt come out.
If you like to lifeskill I'd recommend keeping a character at level 49 and not leveling them up to 50 as that's when pvp mode becomes active. It would make sense to not have your primary life skill character also be a combat character in my opinion. It's nice to not have to worry about being ganked when doing life skill activities on a level 49 or lower character.
I think Woosa is a solid choice for a pve grind character at the moment. Shai is good and can perform but Woosa's damage takes less effort to kill stuff.
But you should also play what you enjoy and have fun with, class balance will shift with time.